While Voyager 1 is still in the heliosphere, new data also suggests that the intensity of energetic particles from inside the bubble are slowing down, while the intensity from charged particles near the outer shell of the bubble, known as the heliosheath, are ramping up.

Voyager scientists still have to analyze the latest data set, which they believe will shed more light on when the probe will break through the solar boundary.

Voyager 1's twin, Voyager 2 is moving slower and is currently about 9 billion miles away from the sun.

This artist's concept shows NASA's two Voyager spacecraft exploring a region of space known as the heliosheath, the outer shell of the bubble of charged particles around our sun.
NASA